Does anyone else have a "thing" or like the way non polarity contingent wiring looks? By non polarity dependent I mean electrical designs where the neutral side of the line is switch internally as much as the hot side of the mains.

Here is a nice example I fell in love with on reddit.

The Live Side:

The live mains hot wire hits the fuse, where it leaves the other side as a brown wire, hitting one terminal of the cavity lamp socket, transitioning to black going down to hit the primary interlock terminal, transition back to brown providing power to the electronic control. Going through the primary interlock itself onto the other terminal, one yellow wire then heads over to the fan motor, a black wire heads down to the monitor switch transitioning to red which heads over to the turn table motor. Going through the monitor switch (acting as dual secondary switch and short switch) a red wire emerges going down to one terminal of the magnetron's step up transformer. A white wire emerges from the other terminal of the step up transformer heading over to the normally open cook relay.  

The cavity lamp always remains live, and with the door closed the turn table motor, fan motor and magnetron step up transformer are always at 120 volt potential.   

The Neutral Side:

White mains side comes in and hits the MOT thermostat, going through it, transitioning to blue, hitting the cavity thermostat. Going through the cavity thermostat, a white wire emerges where it goes down to the shorting terminal of the monitor switch, transitioning to blue going to the cook relay, from there heading over to the neutral side of the 3 terminal Molex connector for the electronic control. On the electronic control there is relay which connects the 3 terminal Molex connector yellow wire to the blue neutral wire to complete the circuit for the cavity lamp, stirrer and fan motor. The yellow wire emerging from the 3 terminal Molex connector heads over to the other terminal of the cavity lamp, where it splits into two blue wires, one heading to the other terminal of the fan motor, the other heading down to the turn table motor. 

What is so fascinating about this design is how so much of the safety, functional and cycle switching is done through the neutral wire. Where as only fusing and the door is done through the hot wire.

I'm guessing who ever engineered this was used to 230 volt 50Hz Schuko appliances where the plug can typically be inserted any way and polarity does not matter. I kind of like it in a strange way as both legs are switched internally.

More pictures can be found in the Reddit link.

@me: Yes, you got it! Switching the neutral instead of the live. None existent in some appliances, common in others.

@Fans of Fans: I'm wondering the same thing. I'm guessing to deal with older homes from the 40s and earlier that may not have had polarized outlets.

@CFZ2882: I remember that! One side was referenced to the chassis, latter models used a high impedance resistor in series with the incoming neutral before connecting to the chassis. Thankfully that to went away latter on.